Horizontal and vertical riffle



Aug. 27, 1929. REA

HORIZONTAL AND VERTICAL RIFFLE Filed Aug. 27, 1928 l'lilllllllllllllllllRm WF .N R m w WW 6 My Patented Aug. 27, 1929.

. N ITED A -155 1,725,765 PATENT: OFFICE.

"l nrcnaanin nn, Lone 'inAc CALIFORNIA.

HoRI'zoNThuAiqn vEarIc L RIEFLE.

Appli cationfiletl-Augu st 27, '1928." Seria1=No. 302,255.

This invention relates to a rifle for the separation of metals from thepulp. or sand. An object of my invention is to provide a riflle, thebafles of which extend both vertically and horizontally and which iseffective in recovering a maximum amount of the metals from the pulp,sand, or the like.

Another object is to provide a rifle which also acts as a classifier toprevent the large and heavy particles from mingling with the pulpcontaining the metal.

A further object is to so break up the flow of pulp by means of eddiestherein so that the metals are prevented from flowing over the top ofthe pulp in a scum but are thrown downwardly and deposited on the floorof the rifle.

Other objects, advantages, and features of invention may appear from theaccompanying drawing, the subjoined detailed description, and theappended claims.

In the drawing:

Fig. 1 is a. fragmentary side elevation of my rifle with parts brokenaway to show the interior. a

Fig. 2 is a fragmentary plan view of the same with the upper perforatedplate broken away.

Fig. 3 is a sectional view taken on line 3-3 of Fig. 2.

Fig. 4 is a fragmentary perspective View of the upper perforated plate.

Fig. 5 is a fragmentary enlarged plan view of the perforated plate.

Fig. 6 is a fragmentary transverse sectional view of the same.

Fig. 7 is a view similar to Fig. 6 showing the depending lip at anangle.

Fig. 8 is a view similar to Fig. 6 showing the depending figure inanother angle.

Referring more particularly to the drawln z The numeral 1 indicates asluice box of any desired size and of usual construction. This sluicebox is set at an angle so that the pulp travels therethrough by gravity,all of which is usual and well-known in the art. On the floor 2 of thesluice box I provide 7 horizontal rifles 3, the rifles extendingtransversely of the box. The rifle 3 may be constructed in a number ofdifferent ways, namely, they may be formed integral with the floor ofthe box by forming transverse grooves thereon, a separate metal platemay be provided having grooves thereon, or a coarse corduroy may beutilized. The corduroy may be either cloth, rubber, or some suitablecomposition material.

The rifle 3 extends the full width of the box and extends substantiallythe entire length thereof. A rifle tray 4 is provided in the box 1 overthe rifle 3, said tray extending substantially the full width of the boxand over the length thereof. The tray I is provided with a series ofrows of holes 5 so that the pulp is permitted to pass downwardly throughthe tray. In cutting the holes 5 the lips 6 thus formed are downwardlybent, either at right angles to the tray, as shown in Figure 6, or at anangle rear-wardly or forwardly, as shown in Figures 7 and 8. These lipsrest upon the rifle 3 and are passed tightly thereon so that no liquidcan pass under the same.

The rows of holes 5 are placed in staggered relation to each other sothat there is no free continuous passage from one end to the other underthe tray 4. That is, the pulp, in passing through the sluice box mustimpinge upon the depending lips 6. The action of the rifle is such thatas the pulp flows through the box, first downwardly through the openings5, and then around the fingers or lips G, eddies are formed which tendto throw the metal held in suspension in the pulp,'downwa1'-dly so thatit will be caught in the vertical rifle 3. The tray 4 may be formed ofmetal or any other material which is found desirable.

Having described my invention, I claim:

'1. In a sluice box, a vertical rifle in said box, a plate spaced-abovesaid rifle, said plate having rows of openings therein, said rows beingin staggered relation each to the other, and depending lips extendingfrom the plate and resting on said rifle.

2. In a sluice box, a vertical rifle in said box, a plate spaced abovesaid rifle, said plate having rows of openings therein, said rows beingin staggered relation each to the other, and depending lips extendingfrom the plate and resting on said rifle, said lips being formed by thesections cut out to form the openings in the plate.

3. In a sluice box, a rifle in the bottom of said sluice box, said riflebeing formed with transversely extending grooves therein, a plate spacedabove said rifle, said plate having openings cut therein, and lips bentdownwardly from the plate and resting on the rifle.

4. In a sluice box, a rifle in the bottom having openings cuttherein,and lips bent downwardly from the plate and restin'g'on the rifile, saidlips being. set .in rows and ad aCent rows being in staggered relation.

5. In a sluice box, a rifiiewin the bottom of said sluice box, saidriflie being formed with transversely extending grooves therein, 10

said riflie being; removable from the sluice box and separate from thebottom thereof, a plate spaced above said riflle, said plate havingopenings cut therein, and lips downwardly bent from the plate andresting on the rifi'tle.

In testimony whereof, I ailix my signature.

RICHARD REA.

